Microchip Technology Firmware Engineer interview questions

The HR approached me, He had a video call with me and asked about my background.After almost a month,He set up a phone screening with the Manager. Had a good 30 min conversation,Asked me few questions on functions and he asked me to come onsite the next week. Two days after interview I get a reject mail,No reasons given.No reply to follow up email sent. Didn't expect this from a company like Microchip .